/**
 *  @FileName: StackDemo.java
 *  @Last Modified Date: CharlW
 *  @Description: class StackDemo
 */

import java.util.*;

public class StackDemo {
	static void showpush(Stack st, int a) {
		st.push(new Integer(a));
		System.out.println("push(" + a + ")");
		System.out.println("Stack: " + st);
	}
	
	static void showpop(Stack st) {
		System.out.print("pop -> ");
		Integer a = (Integer) st.pop();
		System.out.println(a);
		System.out.println("Stack: " + st);
	}
	
	public static void main(String[] args) {
		Stack st = new Stack();
		System.out.println("stack : " + st);
		showpush(st, 42);
		showpush(st, 66);
		showpush(st, 99);
		showpop(st);
		showpop(st);
		showpop(st);
		try {
			showpop(st);
		} catch (EmptyStackException e) {
			System.out.println("empty stack");
		}
	}
}